hatching and gender probability

Alrighty, I am going to hatch for the first time eggs in a bator. I was hoping you all could help me figure out how to figure out the probability of genders and hatch rate.

Ok I will have:

4 blue b. Cochins
4 White silikies
4 splash polish
5 seramas

I will be using a LG circulated bator w/ turner that has held temps well for the week I tested it. So assuming the fertility is good and I do everything right and I get a 50% hatch rate which is about 8 or 9 chicks. Is there anyway I can figure out how many boys and girls there will be?

Also this being my very first hatch w/o a broody momma I would LOVE any and all tips and hints.